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![Five of the grooviest vintage NSA security posters](https://cdn.muckrock.com/news_images/2018/06/28/Mouth.jpg.800x600_q85_crop.jpg)
Five of the grooviest vintage NSA security posters
by
JPat Brown
After a couple decades of wholesomeness, terror, and wholesome terror, the National Security Agency’s security posters took a turn for the mellow in the ’70s. Here’s five of our favorites.